Azoxybenzene and Aluminum Chloride test
Procedure
Place 0.5 mL or 0.4 g of the dry compound in a clean, dry test tube; add one crystal of azoxybenzene and about 25 mg of anhydrous aluminum chloride. Note the color. If no color is produced immediately, warm the mixture for a few minutes. Wait for up to 30 min to observe any color change. If the hydrocarbon is a solid, a solution of 0.5 g of it in 2 mL of dry carbon disulfide may be used.
Positive Test
Formation of 4-arylazobenzene and aluminum chloride complex is a positive test.
Complications
Many oxygen-containing functionalities interfere with this test and produce confusing color changes.
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